Biology

Photosynthesis in Plants

1,492 Questions

Photosynthesis is the biological process by which plants convert light energy into chemical energy. This page contains practice questions covering essential topics like chlorophyll, light reactions, and the pathways specific to plants. This material is crucial for medical entrance exams and academic assessments.

Chlorophyll and pigmentsLight reactionsCalvin cycleCAM plantsElectron transportPhotosynthesis factors

Photosynthesis in Plants Questions

Multiple choice

Carbon dioxide fixation occurs in

  1. ribosomes

  2. plastids

  3. cell wall

  4. chloroplasts
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Chloroplasts work to convert the light energy of the Sun into the sugars that can be used by cells.

Multiple choice

Which part of the cactus plant performs the function of photosynthesis?

  1. Root

  2. Stem

  3. Leaves

  4. Spines
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cactus is a plant which grow in deserts. Thus to avoid the loss of excess water through stomata its leaves are reduced to spine like structures and it is the stem in these plants which is green in colour and performs the functions of photosynthesis.

Multiple choice

In which of the following parts of a plant is chlorophyll present?

  1. On the surface of chloroplast

  2. Dispersed throughout chloroplast

  3. In the stroma of chloroplast

  4. In the grana of chloroplast
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 Chlorophyll is present in the grana of chloroplast. It is the main pigment in green plantsrequired for photosynthesis.

Multiple choice

Grana refers to

  1. stacks of thylakoids in plastids

  2. byproduct of photosynthesis

  3. site of respiration in plants

  4. site of nitrogen fixation in plants
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 Grana refers to stacks of thylakoids in plastids.They are the site of the light-dependent reactions of photosynthesis.

Multiple choice

Dark reaction in photosynthesis is called so because

  1. it can occur in dark

  2. it does not require direct light

  3. it cannot occur during daytime

  4. it occurs more rapidly at night
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 Dark reaction in photosynthesis is called so because it does not require direct light for the reaction to occur. This reaction occurs in the stroma, the fluid-filled area of a chloroplast outside of the thylakoid membranes.

Multiple choice

Yellow colour of leaves is due to the presence of

  1. xanthophylls

  2. melanin

  3. anthocyanins

  4. chlorophyll
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Xanthophylls are the typical yellow pigments of leaves. A green leaf is green because of the presence of a pigment known as chlorophyll, which is inside an organelle called a chloroplast. Anthocyanins are water-soluble vacuolar pigments that may appear red, purple, or blue depending on the pH. Melanin is a class of compounds that serves as a pigment with different structures responsible for dark, tan, yellowish/reddish pigments in marine animals. 

Multiple choice

The dark reaction of photosynthesis occurs in

  1. grana lamellae of chloroplast

  2. stroma of chloroplast

  3. thylakoids of chloroplast

  4. stromas lamellae of chloroplast
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The dark reaction of photosynthesis occurs in stroma of chloroplast.

Multiple choice

What is the name given to the food preparation process in plants?

  1. Photosynthesis

  2. Respiration

  3. Transpiration

  4. Chemosynthesis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

All green plants prepare their food using inorganic raw materials. The process is known as photosynthesis. Respiration is the process of release of energy with inhalation of oxygen and exhaling of carbon dioxide. Transpiration refers to the loss of water through stomata by leaves. Chemosynthesis refers to formation of organic substances from CO2 or methane.